| 摘要 |
PROBLEM TO BE SOLVED: To suitably detect a reference position just after an engine starting and on the following regular running. SOLUTION: In ECU1, a wave-shaping circuit 20 is formed of a pulse series with a predetermined angle interval, and generates a rotary signal having the reference position midway. A signal processing circuit 30 generates a reference position signal corresponding to the reference position of the rotary signal. A microcomputer 10 detects the reference position by interrupting each effective edge of the rotary signal. At the beginning of the engine starting, the detected result of the reference position by interruption is made effective to detect a crank angle position based on the result. After the engine starting when the signal processing circuit 30 is judged as normal operating, the reference position from the signal processing circuit 30 is made effective in lieu of the result of the reference by interruption as to detect the crank angle position by the reference position signal. COPYRIGHT: (C)2004,JPO
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